add Y axis of building to mesh height

src/engine/gameManager/BuildingManager.java

@@ -993,7 +993,7 @@ public enum BuildingManager {
                     return; //no data for this mesh
 
                 Mesh generatedMesh = new Mesh();
-                generatedMesh.meshHeight = mesh_heights.get(mesh);
+                generatedMesh.meshHeight = building.loc.y + mesh_heights.get(mesh);
                 ArrayList<ArrayList<Vector3f>> triPoints = mesh_triangle_points.get(mesh);
 
                 if (mesh_bounding_boxes.containsKey(mesh)) {